Introduce qtquicktests/ with a single test. This allows us to write
tests entirely in QML with no C++ component.
The single test tests for regressions in issue #49.
The qtquicktests framework (supplied by QT/QML upstream) provides only a
template expansion that provides a main() function. Therefore, we must
generate a new binary as the shim for running the tests, as the public
API mechanism doesn't allow us to generate a single binary with the two
backends.
As qmake supports only one binary per directory (without getting really
hacky), we must add a new directory for it.
Perhaps now the tests/ directory should be renamed to cpptests/ or
something for clarity.
Unfortunately "make check" doesn't work, so I've provided a "./run"
wrapper you can run manually from inside the qtquicktests/ directory for
now. This is because qtquicktests appears to have been designed to test
QML apps, not plugins. This isn't much of a problem, except that the
test runner is unable to find the in-tree built plugin.
The generated binary does support a "-plugins <directory>" option, but
it seems to be impossible to get "make check" to use it:
* The qmake extension supports an INCLUDESPATH to add a
"-includes <directory> option, but no equivalent PLUGINSPATH.
* Even though qtquicktests reports "." as being in the plugins
path after a failure, it does not appear to actually look there, so
symlinking or copying the plugin in to the current directory doesn't
work.
* qmltestcase.prf uses testcase.prf which allows TESTARGS to be
added. However, it reads this from the environment (a Makefile
variable) rather than from a qmake variable. There appears to be no
way of exporting a Makefile variable from a .pro file (unless its
name is to start with EXPORT_). See
http://stackoverflow.com/q/35554105/478206.
* Copying and modifying mysqltestcase.prf from
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/features/ to add a PLUGINSPATH
configurable option does work, but then you have to run qmake with
"QMAKEFEATURES=. qmake" since even though it is documented to look in
the project root, that doesn't work (I tried both the top level and
inside qtquicktests/).
So I gave up trying to get "make check" to work, and resorted to a
wrapper around calling qtquicktests with the correct options, which at
least works for now.
